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Old 04-06-2012, 07:06 PM   #1
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Default Tips needed on drilling and countersinkng carbon plates

Hi. What kind of countersinking tip do I need for m3 screws? There are many different kinds here and i don't know which to use. What kind of drill bit should I use to avoid splintering? Holes I need to drill are very close to the outer edge of bottom deck. Thanks in advance.
http://www.mcmaster.com/#drill-bit-countersinks/=gzt2re
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Old 04-06-2012, 07:20 PM   #2
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If you go by the catalog at McMaster, the flat head M3 screws that they carry are 90 degree head angle.

A standard countersink works if you go slow. Use a drill press if possible. Standard HSS bits work for drilling.
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Old 04-06-2012, 07:26 PM   #3
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Wear a dust mask at the very least.
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Old 04-06-2012, 07:44 PM   #4
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Dremel sells a stone bit which is very close to the countersink on most screws. The carbon fiber is harsh on most metal countersinks.
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Old 04-07-2012, 09:18 AM   #5
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carbide burr- mcmaster carr sells them, best tool for countersinking,new holes

43035A92 4-40 size but m3 should be close
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Old 04-07-2012, 09:27 AM   #6
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Clamp the carbon to some mdf or plywood which will help prevent splintering. And only use new, sharp bits and feed it through slowly on a drill press. I use HSS drills and countersinks, but they do go blunt quickly
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Old 04-07-2012, 09:50 AM   #7
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Yes, metric countersinks are all 90 degrees - same as a normal drill. HTH
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Old 04-07-2012, 09:54 AM   #8
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For consistent results with the countersink, use a depth stop on the drill press.
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Old 04-07-2012, 10:41 AM   #9
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Solid-Carbide Drill-Point Countersinks

http://www.mcmaster.com/#countersinks/=h0580x

Nothing better. You want 90 degree for M3
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Old 04-07-2012, 03:12 PM   #10
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Thank you all
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